Cam sheave for brakes



' 1,470,44 V. R. WILLOUGHBY CAM SHEAVE FOR BRAKES Oct. 9, 1923? Filed Aug. 29. 1921 2 Sheets-sheet 1 V- R. WILLOUGHBY 6AM SHEAVE FOR BRAKES 0a; 9, 1923. l 1,47oL414 Filed Aug. 29 1921 2 Sheets-Sheet 2 NVENTR.'

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Patented Oct. 9,. 1923..."

UNITED -STATES PATENIT OFFICE.

vIOToR R. WILLOUGHRY, OE RIDGEWOOD, NEW JERSEY, AssIGNOR To AMERICAN CAR AND EOUNDRY COMPANY, OE NEW YORK, N. Y., A CORPORATION OE NEW JERSEY.

CANI sIIEAvE EoR BRAKES.

Application nien Augst 2s, 1921. serial No. 496,443.

To all whom. t may concern.'

Be it known that I, VICTOR R. WILLOUGH- BY, residing at Ridgewood, Bergen County, New Jersey, and being a citizen of the 6 United States, have invented certain new and useful Improvements in a Cam Sheavc f for Brakes, of which the following is a full, clear, and exact' description, such as v will enable others skilled in the art to which 10 it appertains to make and to use the same,

reference being had to the accompanying drawings, ,which illustrate the preferred form of the invention; though it is to be understood that the invention is not limited vl5 to the exact details of construction shown ture shown in Fig. 2, the car end sill being:

shown in section, with the brake in the released position;

Fig. 4 is a section taken on the line 4 -4 of Fig. 3; and

Fig. 5 isa view similar to Fig.- 3 with the ybrake in the applied position.

It isI an object of my invention to provide .an improved brake-mechanism and if, is also. an object f my invention to provide an improved cam sheave for a brake f mechanism adapted to operate at one vlever ratio 40 while -the shoes are being moved to`en'gage lfwith the wheels and lto operate at another lever ratio thereafter.

In the embodiment of my invention shlown in the drawings theJ` car floor frame comprises an end sill 1 and center sills 2 upon which is mounteda brake cylinder. 3 having a push rod. 4 adapted to-operate' a brake lever 5 supported on guides 6l carried by the center sills 2. Tothe brake lever 4 are 50 connected the brake-rods 7 and 8 and an operating rod 9, the brake rods 7 and 8 being connected to a suitable truck brake mecha` nism 10, shown diagrammatioally invFig.

Attached to one of the center sills 2 is an angle member 11 to which is 'secured one end of a stirrup 12 which hasit-s other end connected yto the end sill 1. A brake staff 13 ismounted on the stirrup 12 and projects through 'a guide member 14 attached tothe end sill 1. Secured to the stirrup 12 is a projecting arm 15 which serves to support oneendof a bolt 16, the other end of which is supported by an angle member 17 connected to a center sill 2. The bolt 16 isprovided with a tubular sleeve 18v and serves as an axle 1for. a cam sheave 19.

The cam sheave 19 comprises a plurality of winding faces 20 .and."21, the winding face 20 beingcircular with its center lying in the axis of the Bolt 16- and adapted'to receive a' single turn of a chain' 23 that is connected to the rod 9 and secured tO-the sheave 19 'by a pin 24 passing through the lugs. on the sheave 19. The diameter of the winding face- 20 is such that. in a, single turn it will wind sufiicient chain to cause a full movement ofthe lever' 5. The

'face 21 .has two circular portions 26 and 27 connected by portions 28 and 29, the radius of the portion 26 being substantially the same as the radius of the face 20. The face 21 is adapted to receive a single turn of a chain 30 connected to the brake stati' 13 and secured'to the sleeve 19- by a pin 31 passing through the lugs 32. As shown 'in Fig- 3 the in 31 is so positioned that in the release position of. the sheave 19 the operation is designed to give a quick move' ment of the shoes to the wheels and is suiif cient to bring new brake shoes into contact with the wheels. i

The v sh'oesvexert pressure on ythe vwheels only after thecamslieave 19 has reached the position, shown in Fig, 5, in. which v'the chain is bein unwound from the portion 27 andthe e ective lever ratio of the sheavc.

has been increased to its maximum,l

What I claim is:

1. A plurality of sills, a brake lever, a brake staff, a. stirrup carried 'by said sills adapted to support said staH, means connecting said lever and said stall' comprising a power multiplying shcave and means connected to said sills; and stirrup, adapted to support said4 sheave. v

2. The combination of center and end sills, a stirrup connecting said sills, a brake staff carried by said stirrup, a power mulytiplying sheave connected to said center sill, a power connection between said stall and sheave and a`strut between said sheave and stirrup.

`3. The combination ofcar sills, a stirrup connecting said sills, a brake staff carried by said stirrup, a power multiplying sheave operated by said stall and supported from one of said sills and a strut connecting said sheave and stirrup.

4. The combination of car framing members, a -fstirrup connecting ,said framing members, a brake sta mounted on said stirrup,`a power multiplying sheave oper-- ated by said staff and connected to one of said framing members and a strut connecting said sheave to the stirrup.

In witness whereof I have hereunto sct my hand in the presence of two witnesses.

VICTOR R. WILLOUGHBY.V

Witnesses:

AnoLPH KAssLER, R. W. SMITH. 

